CN116409296A - Spring parking braking system and method based on electrohydraulic brake - Google Patents
Spring parking braking system and method based on electrohydraulic brake Download PDFInfo
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- CN116409296A CN116409296A CN202310410969.5A CN202310410969A CN116409296A CN 116409296 A CN116409296 A CN 116409296A CN 202310410969 A CN202310410969 A CN 202310410969A CN 116409296 A CN116409296 A CN 116409296A
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- parking brake
- brake
- parking
- spring
- piston
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000012530 fluid Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 3
- 238000005381 potential energy Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/02—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with mechanical assistance or drive
- B60T13/04—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with mechanical assistance or drive by spring or weight
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Braking Arrangements (AREA)
- Regulating Braking Force (AREA)
- Braking Elements And Transmission Devices (AREA)
Abstract
The invention discloses a spring parking brake system and method based on an electrohydraulic brake. Compared with manual parking braking, the invention has the advantages of large braking force and simple operation. Compared with the common electronic parking brake, the invention directly uses the spring as a power source, does not need a parking brake motor, a worm gear and other transmission mechanisms, has simple structure and low cost. Even if the electrical system of the automobile is completely failed, enough braking force can be generated, and the safety and reliability are high. Meanwhile, the unsprung quality of the automobile is not increased, and the riding comfort of the automobile is not reduced.
Description
Technical Field
The invention relates to the technical field of automobile braking, in particular to a spring parking braking system and method based on an electrohydraulic brake.
Background
A parking brake is a necessary component of an automobile that applies and maintains a constant braking force to the wheels of the automobile while the automobile is parked, so as to prevent the automobile from being pushed by external forces. The parking brake is usually a hand brake, and generates braking force by manpower during braking. The parking brake is completely dependent on manpower, the operation is laborious, and the braking force is small. For this reason, some automobiles use a spring type parking brake, which generates braking force by the elastic force of a brake spring. The parking brake has large braking force and convenient operation, and only one control valve is needed to be pulled. However, the conventional spring type parking brake requires compressed air as power, and a general passenger car uses hydraulic braking without a compressed air source, so that the spring type parking brake can only be used on buses and trucks using pneumatic braking.
In order to improve the convenience of operation, many passenger vehicles use an electronic parking brake. The electronic parking brakes are divided into two types, one of which is to mount a parking brake motor at a wheel as shown in fig. 1. During parking braking, the motor 100 drives the transmission mechanism 101 to drive the service brake 102 to brake the wheels 103. The parking brake needs two motors and two sets of transmission mechanisms, and has high cost and complex structure. Meanwhile, as the whole braking system is arranged on the wheels, the unsprung mass of the automobile is increased, and the riding comfort of the automobile is reduced.
Another type of electronic parking brake is to use a motor 200 plus worm 201 and worm gear 202, plus a cable to brake, as shown in fig. 2. During braking, the motor 200 rotates the worm 201, thereby driving the worm wheel 202 to rotate, and the worm wheel 202 pulls the balance bar 204 through the wire rope 203. The balance bar 204 in turn pulls the wire rope 206 connected to the service brake 205, thereby driving the service brake 205 on the wheel and braking the wheel. The parking brake has simple structure, does not increase the unsprung mass of the automobile, and has good riding comfort. But still requires a motor and corresponding worm and worm wheel.
With the progress of technology and the higher and higher requirements on energy conservation and environmental protection, more and more automobiles such as electric automobiles, hybrid electric automobiles and the like are driven by electricity. These vehicles typically use electro-hydraulic brakes for convenience in recovering energy during deceleration. The electrohydraulic brake not only can output braking hydraulic pressure to generate braking force when a driver presses a brake pedal, but also can receive instructions sent by a whole vehicle controller to output the braking hydraulic pressure to generate braking force when the driver does not press the brake pedal.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a spring parking brake system and a method based on an electrohydraulic brake.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a spring parking brake system based on an electrohydraulic brake comprises the electrohydraulic brake, a parking brake electromagnetic valve, a parking brake oil pipe, a parking brake hydraulic cylinder, a piston, a parking brake spring, a parking brake handle, a guy cable, a lock catch, a ratchet bar, a balance bar, a left guy cable, a right guy cable and wheel brakes; the left side of the parking brake hydraulic cylinder is connected with the electro-hydraulic brake through a parking brake oil pipe and a parking brake electromagnetic valve; a parking piston and a parking brake spring are arranged in the parking brake hydraulic cylinder, the parking brake spring is connected with the right side of the piston, and the right side of the piston is connected with one end of the ratchet bar; the parking brake handle is connected with the lock catch through a stay rope, and the lock catch can be separated from or contacted with the ratchet bar; the other end of the ratchet bar is connected with the middle part of the balance bar, and the two ends of the balance bar are respectively connected with the left inhaul cable and the right inhaul cable; the left cable and the right cable are respectively connected with wheel brakes of the left rear wheel and the right rear wheel, and the wheel brakes can brake the left rear wheel and the right rear wheel when the cables are pulled leftwards.
Further, the system also comprises a liquid outlet electromagnetic valve, and brake liquid output by the electro-hydraulic brake can flow to the wheel brake through the liquid outlet electromagnetic valve.
The invention also provides a working method of the spring parking brake system, which comprises the following specific processes:
when the parking brake is released, the driver puts down the parking brake handle, the inhaul cable is released, the lock catch is contacted with the ratchet bar, and the lock catch does not lock the ratchet bar completely at the moment; at the moment, the electrohydraulic brake closes the liquid outlet electromagnetic valve, opens the parking brake electromagnetic valve and outputs hydraulic pressure to the parking brake hydraulic cylinder, thereby pushing the piston rightwards, compressing the parking brake spring and pushing the ratchet bar rightwards, at the moment, the pulling force of the left inhaul cable and the right inhaul cable disappears, the parking brake is released, and at the moment, the ratchet bar is locked by the lock catch and cannot move;
when the piston is pushed to the right to the limit position, the electro-hydraulic brake does not output pressure any more, and the parking brake spring is required to rebound to push the piston to the left; but at this time, the ratchet bar is locked by the lock catch and cannot be pulled leftwards, so that the left inhaul cable and the right inhaul cable cannot be pulled, and braking force cannot be generated.
Further, when parking braking is needed, the parking braking electromagnetic valve is opened, a driver pulls the parking braking handle, so that the inhaul cable is pulled, the lock catch is pulled upwards, the lock catch is separated from the ratchet bar, and at the moment, the parking braking spring pushes the piston leftwards under the rebound potential energy; brake fluid in the parking brake hydraulic cylinder flows back to the electrohydraulic brake through the parking brake oil pipe and the parking brake electromagnetic valve; the piston pulls the ratchet bar, thereby pulling the balance bar; the balance rod pulls the left inhaul cable and the right inhaul cable so as to drive the wheel brake to brake the left wheel and the right wheel; the braking force of the parking brake is completely from the rebound force of the parking brake spring, and the braking force is not changed with time or the pressure change of the parking brake hydraulic cylinder, so that the parking braking force is maintained.
Further, when the parking brake is not used, the parking brake electromagnetic valve is closed, the service brake electromagnetic valve is opened, and the electro-hydraulic brake can normally brake and is not influenced by the parking brake.
The invention has the beneficial effects that: compared with manual parking braking, the invention has the advantages of large braking force and simple operation. Compared with the common electronic parking brake, the invention directly uses the spring as a power source, does not need a parking brake motor, a worm gear and other transmission mechanisms, has simple structure and low cost. Even if the electrical system of the automobile is completely failed, enough braking force can be generated, and the safety and reliability are high. Meanwhile, the unsprung quality of the automobile is not increased, and the riding comfort of the automobile is not reduced.
Drawings
FIG. 1 is a schematic diagram of a prior art electronic parking brake;
FIG. 2 is a schematic diagram of another prior art electronic parking brake;
FIG. 3 is a schematic diagram of a spring parking brake system according to embodiment 1 of the present invention;
FIG. 4 is a schematic diagram showing a state of a spring parking brake system when releasing a parking brake in embodiment 2 of the present invention;
fig. 5 is a schematic diagram showing a state of a spring parking brake system at the time of parking brake in embodiment 2 of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that, while the present embodiment provides a detailed implementation and a specific operation process on the premise of the present technical solution, the protection scope of the present invention is not limited to the present embodiment.
Example 1
The embodiment provides a spring parking brake system based on an electrohydraulic brake, which comprises an electrohydraulic brake 1, a liquid outlet electromagnetic valve 2, a parking brake electromagnetic valve 3, a parking brake oil pipe 4, a parking brake hydraulic cylinder 5, a piston 6, a parking brake spring 7, a parking brake handle 8, a stay rope 9, a lock catch 10, a ratchet bar 11, a balance bar 12, a left stay rope 13, a right stay rope 14 and a wheel brake 15 as shown in fig. 3; the left side of the parking brake hydraulic cylinder 5 is connected with the electro-hydraulic brake 1 through a parking brake oil pipe 4 and a parking brake electromagnetic valve 3, and brake fluid output by the electro-hydraulic brake 1 can flow to a wheel brake 15 through a fluid outlet electromagnetic valve 2; a parking piston 6 and a parking brake spring 7 are arranged in the parking brake hydraulic cylinder 5, the parking brake spring 7 is connected with the right side of the piston 6, and the right side of the piston 6 is connected with one end of a ratchet bar 11; the parking brake handle 8 is connected to the lock catch 10 through a stay rope 9, and the lock catch 10 can be separated from or contacted with the ratchet bar 11 by pulling or putting down the parking brake handle 8; the other end of the ratchet bar 11 is connected with the middle part of a balance bar 12, and two ends of the balance bar 12 are respectively connected with a left inhaul cable 13 and a right inhaul cable 14; the left and right cables 13 and 14 are connected to wheel brakes 15 of the left and right rear wheels, respectively, and the wheel brakes 15 brake the left and right rear wheels when the cables are pulled leftwards.
Example 2
The embodiment provides a working method of the spring parking brake system described in embodiment 1, which specifically includes the following steps:
when the parking brake is released, the driver puts down the parking brake handle 8, the stay rope 9 is released, the lock catch 10 is in contact with the ratchet bar 11, and the lock catch 10 does not completely lock the ratchet bar 11 at the moment; at this time, the electrohydraulic brake 1 closes the liquid outlet electromagnetic valve 2, opens the parking brake electromagnetic valve 3 and outputs hydraulic pressure to the parking brake hydraulic cylinder 5, thereby pushing the piston 6 rightward, compressing the parking brake spring 7, pushing the ratchet bar 11 rightward, at this time, the pulling force of the left cable 13 and the right cable 14 disappears, and the parking brake is released, at this time, the ratchet bar 11 is locked by the lock catch 10 and cannot move, as shown in fig. 4.
When the piston 6 is pushed to the right to the limit position, the electro-hydraulic brake 1 does not output pressure any more, and the parking brake spring 7 is required to rebound to push the piston 6 to the left; but at this time the ratchet bar 11 is locked by the lock catch 10 and cannot be pulled to the left, so that the left and right cables 13 and 14 are not pulled and thus no braking force is generated.
When the parking brake is needed, the parking brake electromagnetic valve 3 is opened, a driver pulls the parking brake handle 8, so that the inhaul cable 9 is pulled, the lock catch 10 is pulled upwards to be separated from the ratchet bar 11, and at the moment, the parking brake spring 7 pushes the piston 6 leftwards under the rebound potential energy; brake fluid in the parking brake hydraulic cylinder 5 flows back to the electrohydraulic brake 1 through the parking brake oil pipe 4 and the parking brake solenoid valve 3; the plunger 6 pulls the ratchet bar 11 and thus the balance bar 12 as shown in fig. 5. The balance rod 12 pulls the left cable 13 and the right cable 14 so as to drive the wheel brake 15 to brake the left wheel and the right wheel; the braking force of the parking brake is completely from the rebound force of the parking brake spring 7, and the braking force is not changed with time or the pressure change of the parking brake hydraulic cylinder 5, so that the parking braking force is maintained;
when the parking brake is not used, the parking brake electromagnetic valve 3 is closed, the service brake electromagnetic valve 2 is opened, and the electro-hydraulic brake 1 can normally brake and is not influenced by the parking brake.
Various modifications and variations of the present invention will be apparent to those skilled in the art in light of the foregoing teachings and are intended to be included within the scope of the following claims.
Claims (5)
1. The spring parking brake system based on the electrohydraulic brake is characterized by comprising the electrohydraulic brake, a parking brake electromagnetic valve, a parking brake oil pipe, a parking brake hydraulic cylinder, a piston, a parking brake spring, a parking brake handle, a guy cable, a lock catch, a ratchet bar, a balance rod, a left guy cable, a right guy cable and wheel brakes; the left side of the parking brake hydraulic cylinder is connected with the electro-hydraulic brake through a parking brake oil pipe and a parking brake electromagnetic valve; a parking piston and a parking brake spring are arranged in the parking brake hydraulic cylinder, the parking brake spring is connected with the right side of the piston, and the right side of the piston is connected with one end of the ratchet bar; the parking brake handle is connected with the lock catch through a stay rope, and the lock catch can be separated from or contacted with the ratchet bar by pulling or putting down the parking brake handle; the other end of the ratchet bar is connected with the middle part of the balance bar, and the two ends of the balance bar are respectively connected with the left inhaul cable and the right inhaul cable; the left cable and the right cable are respectively connected with wheel brakes of the left rear wheel and the right rear wheel, and the wheel brakes can brake the left rear wheel and the right rear wheel when the cables are pulled leftwards.
2. The spring parking brake system of claim 1, further comprising a fluid outlet solenoid valve through which brake fluid from the electro-hydraulic brake may flow to the wheel brakes.
3. A method of operating a spring parking brake system as defined in claim 1, comprising the steps of:
when the parking brake is released, the driver puts down the parking brake handle, the inhaul cable is released, the lock catch is contacted with the ratchet bar, and the lock catch does not lock the ratchet bar completely at the moment; at the moment, the electrohydraulic brake closes the liquid outlet electromagnetic valve, opens the parking brake electromagnetic valve and outputs hydraulic pressure to the parking brake hydraulic cylinder, thereby pushing the piston rightwards, compressing the parking brake spring and pushing the ratchet bar rightwards, at the moment, the pulling force of the left inhaul cable and the right inhaul cable disappears, the parking brake is released, and at the moment, the ratchet bar is locked by the lock catch and cannot move;
when the piston is pushed to the right to the limit position, the electro-hydraulic brake does not output pressure any more, and the parking brake spring is required to rebound to push the piston to the left; but at this time, the ratchet bar is locked by the lock catch and cannot be pulled leftwards, so that the left inhaul cable and the right inhaul cable cannot be pulled, and braking force cannot be generated.
4. A method according to claim 3, wherein when parking braking is required, the parking brake solenoid valve is opened, the driver pulls the parking brake handle, thereby pulling the cable, pulling the shackle upwards to disengage it from the ratchet bar, whereupon the parking brake spring pushes the piston to the left under the potential energy of rebound; brake fluid in the parking brake hydraulic cylinder flows back to the electrohydraulic brake through the parking brake oil pipe and the parking brake electromagnetic valve; the piston pulls the ratchet bar, thereby pulling the balance bar; the balance rod pulls the left inhaul cable and the right inhaul cable so as to drive the wheel brake to brake the left wheel and the right wheel; the braking force of the parking brake is completely from the rebound force of the parking brake spring, and the braking force is not changed with time or the pressure change of the parking brake hydraulic cylinder, so that the parking braking force is maintained.
5. A method according to claim 3, wherein when the parking brake is not in use, the parking brake solenoid valve is closed and the service brake solenoid valve is opened, the electro-hydraulic brake being normally braked independently of the parking brake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310410969.5A CN116409296A (en) | 2023-04-18 | 2023-04-18 | Spring parking braking system and method based on electrohydraulic brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310410969.5A CN116409296A (en) | 2023-04-18 | 2023-04-18 | Spring parking braking system and method based on electrohydraulic brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116409296A true CN116409296A (en) | 2023-07-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310410969.5A Pending CN116409296A (en) | 2023-04-18 | 2023-04-18 | Spring parking braking system and method based on electrohydraulic brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116409296A (en) |
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2023
- 2023-04-18 CN CN202310410969.5A patent/CN116409296A/en active Pending
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